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首页> 外文期刊>Advanced Functional Materials >Enhanced Optical Properties and Opaline Self-Assembly of PPV Encapsulated in Mesoporous Silica Spheres
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Enhanced Optical Properties and Opaline Self-Assembly of PPV Encapsulated in Mesoporous Silica Spheres

机译：包覆在介孔二氧化硅球中的PPV的增强的光学性质和不透明的自组装

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摘要

A new poly(p-phenylenevinyiene) (PPV) composite material has been developed by the incorporation of insoluble PPV polymer chains in the pores of monodisperse mesoporous silica spheres through an ion-exchange and in situ polymerization method. The polymer distribution within the resultant colloidal particles is characterized by electron microscopy, energy dispersive X-ray microanalysis, powder X-ray diffraction, and nitrogen adsorption. It was found that the polymer was selectively incorporated into the mesopores of the silica host and was well distributed throughout the body of the particles. This confinement of the polymer influences the optical properties of the composite; these were examined by UV-vis and fluorescence spectroscopy and time-correlated single-photon counting. The results show a material that exhibits an extremely high fluorescence quantum yield (approaching 85%), and an improved resistance to oxidative photobleaching compared to PPV. These enhanced optical properties are further complemented by the overall processability of the colloidal material. In marked contrast to the insolubility of PPV, the material can be processed as a stable colloidal dispersion, and the individual composite spheres can be self-assembled into opaline films using the vertical deposition method. The bandgap of the opal can be engineered to overlap with the emission band of the polymer, which has significant ramifications for lasing.
机译：通过将不溶性PPV聚合物链通过离子交换和原位聚合方法掺入单分散介孔二氧化硅球孔中，开发了一种新型的聚对苯撑乙烯基复合材料。通过电子显微镜，能量色散X射线显微分析，粉末X射线衍射和氮吸附来表征所得胶体颗粒内的聚合物分布。发现该聚合物被选择性地掺入到二氧化硅主体的中孔中并且很好地分布在整个颗粒体内。聚合物的这种限制影响了复合材料的光学性能。通过紫外可见光谱和荧光光谱以及与时间相关的单光子计数对它们进行了检查。结果表明，与PPV相比，该材料具有极高的荧光量子产率（接近85％），并且具有更高的抗氧化光漂白性。胶体材料的整体加工性能进一步增强了这些增强的光学性能。与PPV的不溶性形成鲜明对比的是，该材料可以加工成稳定的胶体分散体，并且可以使用垂直沉积方法将单个复合球自组装成不透明膜。可以将蛋白石的带隙设计为与聚合物的发射带重叠，从而对激光产生明显的影响。

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  • 来源
    《Advanced Functional Materials》 |2009年第23期|3737-3745|共9页
  • 作者

    Timothy L. Kelly; Yuri Yamada; Celine Schneider; Kazuhisa Yano; Michael O. Wolf;

  • 作者单位

    Department of Chemistry, University of British Columbia Vancouver, BC, V6T 1Z1 (Canada);

    Toyota Central R & D Labs, Inc. Nagakute, Aichi, 480-1192 (Japan);

    Department of Chemistry, Memorial University St. John's, NL, A1B 3X7 (Canada);

    Toyota Central R & D Labs, Inc. Nagakute, Aichi, 480-1192 (Japan);

    Department of Chemistry, University of British Columbia Vancouver, BC, V6T 1Z1 (Canada);

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